/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkImageAppend.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "vtkImageAppend.h"

#include "vtkAlgorithmOutput.h"
#include "vtkCellData.h"
#include "vtkDataArray.h"
#include "vtkImageData.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkStreamingDemandDrivenPipeline.h"

vtkStandardNewMacro(vtkImageAppend);

//------------------------------------------------------------------------------
vtkImageAppend::vtkImageAppend()
{
  this->AppendAxis = 0;
  this->Shifts = nullptr;
  this->PreserveExtents = 0;
}

//------------------------------------------------------------------------------
vtkImageAppend::~vtkImageAppend()
{
  delete[] this->Shifts;
}

//------------------------------------------------------------------------------
void vtkImageAppend::ReplaceNthInputConnection(int idx, vtkAlgorithmOutput* input)
{
  if (idx < 0 || idx >= this->GetNumberOfInputConnections(0))
  {
    vtkErrorMacro("Attempt to replace connection idx "
      << idx << " of input port " << 0 << ", which has only "
      << this->GetNumberOfInputConnections(0) << " connections.");
    return;
  }

  if (!input || !input->GetProducer())
  {
    vtkErrorMacro("Attempt to replace connection index "
      << idx << " for input port " << 0 << " with "
      << (!input ? "a null input." : "an input with no producer."));
    return;
  }

  this->SetNthInputConnection(0, idx, input);
}

//------------------------------------------------------------------------------
// The default vtkImageAlgorithm semantics are that SetInput() puts
// each input on a different port, we want all the image inputs to
// go on the first port.
void vtkImageAppend::SetInputData(int idx, vtkDataObject* input)
{
  this->SetInputDataInternal(idx, input);
}

//------------------------------------------------------------------------------
vtkDataObject* vtkImageAppend::GetInput(int idx)
{
  if (this->GetNumberOfInputConnections(0) <= idx)
  {
    return nullptr;
  }
  return vtkImageData::SafeDownCast(this->GetExecutive()->GetInputData(0, idx));
}

//------------------------------------------------------------------------------
// This method tells the output it will have more components
int vtkImageAppend::RequestInformation(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // get the info objects
  vtkInformation* outInfo = outputVector->GetInformationObject(0);
  vtkInformation* inInfo;

  int idx;
  int min, max, size, tmp;
  int *inExt, outExt[6];
  int unionExt[6];

  // Initialize the union.
  unionExt[0] = unionExt[2] = unionExt[4] = VTK_INT_MAX;
  unionExt[1] = unionExt[3] = unionExt[5] = -VTK_INT_MAX;

  // Initialize the shifts.
  delete[] this->Shifts;
  this->Shifts = new int[this->GetNumberOfInputConnections(0)];

  // Find the outMin/max of the appended axis for this input.
  inInfo = inputVector[0]->GetInformationObject(0);
  inExt = inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());
  min = tmp = inExt[this->AppendAxis * 2];
  for (idx = 0; idx < this->GetNumberOfInputConnections(0); ++idx)
  {
    inInfo = inputVector[0]->GetInformationObject(idx);
    inExt = inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());

    if (this->PreserveExtents)
    {
      // Compute union for preserving extents.
      if (inExt[0] < unionExt[0])
      {
        unionExt[0] = inExt[0];
      }
      if (inExt[1] > unionExt[1])
      {
        unionExt[1] = inExt[1];
      }
      if (inExt[2] < unionExt[2])
      {
        unionExt[2] = inExt[2];
      }
      if (inExt[3] > unionExt[3])
      {
        unionExt[3] = inExt[3];
      }
      if (inExt[4] < unionExt[4])
      {
        unionExt[4] = inExt[4];
      }
      if (inExt[5] > unionExt[5])
      {
        unionExt[5] = inExt[5];
      }
      this->Shifts[idx] = 0;
    }
    else
    {
      // Compute shifts if we are not preserving extents.
      this->Shifts[idx] = tmp - inExt[this->AppendAxis * 2];
      size = inExt[this->AppendAxis * 2 + 1] - inExt[this->AppendAxis * 2] + 1;
      tmp += size;
    }
  }

  if (this->PreserveExtents)
  {
    outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(), unionExt, 6);
  }
  else
  {
    inInfo = inputVector[0]->GetInformationObject(0);
    inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(), outExt);
    max = tmp - 1;
    outExt[this->AppendAxis * 2] = min;
    outExt[this->AppendAxis * 2 + 1] = max;
    outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(), outExt, 6);
  }

  return 1;
}

//------------------------------------------------------------------------------
void vtkImageAppend::InternalComputeInputUpdateExtent(
  int* inExt, int* outExt, int* inWextent, int whichInput)
{
  int min, max, shift, tmp, idx;

  // default input extent will be that of output extent
  memcpy(inExt, outExt, sizeof(int) * 6);

  shift = 0;
  if (!this->PreserveExtents)
  {
    shift = this->Shifts[whichInput];
  }
  min = inWextent[this->AppendAxis * 2] + shift;
  max = inWextent[this->AppendAxis * 2 + 1] + shift;

  // now clip the outExtent against the outExtent for this input (intersect)
  tmp = outExt[this->AppendAxis * 2];
  if (min < tmp)
  {
    min = tmp;
  }
  tmp = outExt[this->AppendAxis * 2 + 1];
  if (max > tmp)
  {
    max = tmp;
  }

  // now if min > max, we do not need the input at all.  I assume
  // the pipeline will interpret this extent this way.

  // convert back into input coordinates.
  inExt[this->AppendAxis * 2] = min - shift;
  inExt[this->AppendAxis * 2 + 1] = max - shift;

  // for robustness (in the execute method),
  // do not ask for more than the whole extent of the other axes.
  for (idx = 0; idx < 3; ++idx)
  {
    if (inExt[idx * 2] < inWextent[idx * 2])
    {
      inExt[idx * 2] = inWextent[idx * 2];
    }
    if (inExt[idx * 2 + 1] > inWextent[idx * 2 + 1])
    {
      inExt[idx * 2 + 1] = inWextent[idx * 2 + 1];
    }
  }
}

//------------------------------------------------------------------------------
int vtkImageAppend::RequestUpdateExtent(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // get the outInfo object
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

  // default input extent will be that of output extent
  int inExt[6];
  outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(), inExt);
  int* outExt = outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT());

  for (int whichInput = 0; whichInput < this->GetNumberOfInputConnections(0); whichInput++)
  {
    int* inWextent;

    // Find the outMin/max of the appended axis for this input.
    vtkInformation* inInfo = inputVector[0]->GetInformationObject(whichInput);
    inWextent = inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());

    this->InternalComputeInputUpdateExtent(inExt, outExt, inWextent, whichInput);

    inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(), inExt, 6);
  }

  return 1;
}

//------------------------------------------------------------------------------
static void vtkImageAppendGetContinuousIncrements(int wExtent[6], int sExtent[6], vtkIdType nComp,
  bool forCells, vtkIdType& incX, vtkIdType& incY, vtkIdType& incZ)
{
  // I can not use the one in vtkImageData, since that assumes point scalars
  // and I need it to work for any point or cell array

  int e0, e1, e2, e3;
  incX = 0;
  e0 = sExtent[0];
  if (e0 < wExtent[0])
  {
    e0 = wExtent[0];
  }
  e1 = sExtent[1];
  if (e1 > wExtent[1])
  {
    e1 = wExtent[1];
  }
  e2 = sExtent[2];
  if (e2 < wExtent[2])
  {
    e2 = wExtent[2];
  }
  e3 = sExtent[3];
  if (e3 > wExtent[3])
  {
    e3 = wExtent[3];
  }

  int ptAdjust = (forCells ? 0 : 1);
  int idx;
  vtkIdType increments[3];
  int wholeJump;
  for (idx = 0; idx < 3; ++idx)
  {
    increments[idx] = nComp;
    wholeJump = wExtent[idx * 2 + 1] - wExtent[idx * 2] + ptAdjust;
    if (wholeJump == 0)
    {
      wholeJump = 1;
    }
    nComp *= wholeJump;
  }

  // cerr << "INCS "
  // << increments[0] << " " << increments[1] << " " << increments[2] << endl;
  int dx = (e1 - e0 + ptAdjust);
  if (dx == 0)
    dx = 1;
  int dy = (e3 - e2 + ptAdjust);
  if (dy == 0)
    dy = 1;

  incY = increments[1] - dx * increments[0];
  incZ = increments[2] - dy * increments[1];

  // cerr << "RETURN " << incX << " " << incY << " " << incZ << endl;
}

//------------------------------------------------------------------------------
// This templated function executes the filter for any type of data.
template <class T>
void vtkImageAppendExecute(vtkImageAppend* self, int id, int inExt[6], vtkImageData* inData,
  T* inPtr, int outExt[6], vtkImageData* outData, T* outPtr, vtkIdType numComp, bool forCells,
  int nArrays)
{
  int idxR, idxY, idxZ;
  int maxX, maxY, maxZ;
  vtkIdType inIncX, inIncY, inIncZ;
  vtkIdType outIncX, outIncY, outIncZ;
  int rowLength;
  unsigned long count = 0;
  unsigned long target;
  double dnArrays = (double)nArrays;

  vtkImageAppendGetContinuousIncrements(
    inData->GetExtent(), inExt, numComp, forCells, inIncX, inIncY, inIncZ);

  // cerr << "IN INCS " << inIncX << " " << inIncY << " " << inIncZ << endl;
  vtkImageAppendGetContinuousIncrements(
    outData->GetExtent(), outExt, numComp, forCells, outIncX, outIncY, outIncZ);
  // cerr << "OUT INCS " << outIncX << " " << outIncY << " " << outIncZ << endl;

  int ptAdjust = (forCells ? 0 : 1);
  // find the region to loop over
  maxX = inExt[1] - inExt[0] + ptAdjust;
  if (maxX == 0)
  {
    maxX = 1;
  }
  rowLength = maxX * numComp;
  maxY = inExt[3] - inExt[2] + ptAdjust;
  if (maxY == 0)
  {
    maxY = 1;
  }
  maxZ = inExt[5] - inExt[4] + ptAdjust;
  if (maxZ == 0)
  {
    maxZ = 1;
  }
  // cerr << "SETUP " << endl;
  // cerr << "IE0:" << inExt[0] << " IE1:" << inExt[1] << endl;
  // cerr << "IE2:" << inExt[2] << " IE2:" << inExt[3] << endl;
  // cerr << "IE4:" << inExt[4] << " IE5:" << inExt[5] << endl;
  // cerr << "PTS:" << ptAdjust << " NCOMP:" << numComp << " RL:" << rowLength << endl;

  target = static_cast<unsigned long>((maxZ + ptAdjust) * (maxY + ptAdjust) / 50.0 / dnArrays);
  target++;

  // Loop through input pixels
  for (idxZ = 0; idxZ < maxZ; idxZ++)
  {
    for (idxY = 0; !self->AbortExecute && idxY < maxY; idxY++)
    {
      if (!id)
      {
        if (!(count % target))
        {
          self->UpdateProgress(count / (50.0 * target));
        }
        count++;
      }
      // cerr << "PTRS " << inPtr << " " << outPtr << endl;
      for (idxR = 0; idxR < rowLength; idxR++)
      {
        // Pixel operation
        // cerr << idxZ << "," << idxY << "," << idxR << " " << *inPtr << endl;
        *outPtr = *inPtr;
        outPtr++;
        inPtr++;
      }
      outPtr += outIncY;
      inPtr += inIncY;
    }
    outPtr += outIncZ;
    inPtr += inIncZ;
  }
}

//------------------------------------------------------------------------------
void vtkImageAppend::InitOutput(int outExt[6], vtkImageData* outData)
{
  int idxY, idxZ;
  int maxY, maxZ;
  vtkIdType outIncY, outIncZ;
  int rowLength;
  int typeSize;
  unsigned char *outPtrZ, *outPtrY;

  // This method needs to clear all point-data for the update-extent.

  vtkPointData* pd = outData->GetPointData();
  for (int arrayIdx = 0; arrayIdx < pd->GetNumberOfArrays(); arrayIdx++)
  {
    vtkDataArray* array = pd->GetArray(arrayIdx);
    if (!array)
    {
      continue;
    }

    typeSize = vtkDataArray::GetDataTypeSize(array->GetDataType());
    outPtrZ = static_cast<unsigned char*>(outData->GetArrayPointerForExtent(array, outExt));

    // Get increments to march through data
    vtkIdType increments[3];
    outData->GetArrayIncrements(array, increments);
    outIncY = increments[1];
    outIncZ = increments[2];

    outIncY *= typeSize;
    outIncZ *= typeSize;

    // Find the region to loop over
    rowLength = (outExt[1] - outExt[0] + 1) * array->GetNumberOfComponents();
    rowLength *= typeSize;
    maxY = outExt[3] - outExt[2];
    maxZ = outExt[5] - outExt[4];

    // Loop through input pixels
    for (idxZ = 0; idxZ <= maxZ; idxZ++)
    {
      outPtrY = outPtrZ;
      for (idxY = 0; idxY <= maxY; idxY++)
      {
        memset(outPtrY, 0, rowLength);
        outPtrY += outIncY;
      }
      outPtrZ += outIncZ;
    }
  }
}

//------------------------------------------------------------------------------
// This method is passed a input and output regions, and executes the filter
// algorithm to fill the output from the inputs.
// It just executes a switch statement to call the correct function for
// the regions data types.
void vtkImageAppend::ThreadedRequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* vtkNotUsed(outputVector),
  vtkImageData*** inData, vtkImageData** outData, int outExt[6], int id)
{
  int idx1;
  int inExt[6], cOutExt[6];
  int c_in[3], c_out[3];
  void* inPtr;
  void* outPtr;
  int nArrays;

  this->InitOutput(outExt, outData[0]);

  for (idx1 = 0; idx1 < this->GetNumberOfInputConnections(0); ++idx1)
  {
    // cerr << "INPUT " << idx1 << endl;

    if (inData[0][idx1] != nullptr)
    {
      nArrays = inData[0][idx1]->GetPointData()->GetNumberOfArrays() +
        inData[0][idx1]->GetCellData()->GetNumberOfArrays();

      // Get the input extent and output extent
      // the real out extent for this input may be clipped.
      vtkInformation* inInfo = inputVector[0]->GetInformationObject(idx1);
      int* inWextent = inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());

      this->InternalComputeInputUpdateExtent(inExt, outExt, inWextent, idx1);

      memcpy(cOutExt, inExt, 6 * sizeof(int));
      cOutExt[this->AppendAxis * 2] = inExt[this->AppendAxis * 2] + this->Shifts[idx1];
      cOutExt[this->AppendAxis * 2 + 1] = inExt[this->AppendAxis * 2 + 1] + this->Shifts[idx1];

      c_in[0] = inExt[0];
      c_in[1] = inExt[2];
      c_in[2] = inExt[4];

      c_out[0] = cOutExt[0];
      c_out[1] = cOutExt[2];
      c_out[2] = cOutExt[4];

      // do a quick check to see if the input is used at all.
      if (inExt[0] <= inExt[1] && inExt[2] <= inExt[3] && inExt[4] <= inExt[5])
      {
        vtkIdType ai;
        vtkDataArray* inArray;
        vtkDataArray* outArray;
        vtkIdType numComp;

        // do point associated arrays
        for (ai = 0; ai < inData[0][idx1]->GetPointData()->GetNumberOfArrays(); ai++)
        {
          // cerr << "POINT ARRAY " << ai << endl;

          inArray = inData[0][idx1]->GetPointData()->GetArray(ai);
          outArray = outData[0]->GetPointData()->GetArray(ai);

          numComp = inArray->GetNumberOfComponents();
          if (numComp != outArray->GetNumberOfComponents())
          {
            vtkErrorMacro("Components of the inputs do not match");
            return;
          }

          // this filter expects that input is the same type as output.
          if (inArray->GetDataType() != outArray->GetDataType())
          {
            vtkErrorMacro(<< "Execute: input" << idx1 << " ScalarType (" << inArray->GetDataType()
                          << "), must match output ScalarType (" << outArray->GetDataType() << ")");
            return;
          }

          inPtr = inData[0][idx1]->GetArrayPointerForExtent(inArray, inExt);
          outPtr = outData[0]->GetArrayPointerForExtent(outArray, cOutExt);

          // cerr << "INITIAL PTRS " << inPtr << " " << outPtr << endl;
          switch (inArray->GetDataType())
          {
            vtkTemplateMacro(
              vtkImageAppendExecute(this, id, inExt, inData[0][idx1], static_cast<VTK_TT*>(inPtr),
                cOutExt, outData[0], static_cast<VTK_TT*>(outPtr), numComp, false, nArrays));
            default:
              vtkErrorMacro(<< "Execute: Unknown ScalarType");
              return;
          }
        }

        // do cell associated arrays
        for (ai = 0; ai < inData[0][idx1]->GetCellData()->GetNumberOfArrays(); ai++)
        {
          // cerr << "CELL ARRAY " << ai << endl;

          inArray = inData[0][idx1]->GetCellData()->GetArray(ai);
          outArray = outData[0]->GetCellData()->GetArray(ai);

          numComp = inArray->GetNumberOfComponents();
          if (numComp != outArray->GetNumberOfComponents())
          {
            vtkErrorMacro("Components of the inputs do not match");
            return;
          }

          // this filter expects that input is the same type as output.
          if (inArray->GetDataType() != outArray->GetDataType())
          {
            vtkErrorMacro(<< "Execute: input" << idx1 << " ScalarType (" << inArray->GetDataType()
                          << "), must match output ScalarType (" << outArray->GetDataType() << ")");
            return;
          }

          vtkIdType cellId;
          cellId = vtkStructuredData::ComputeCellIdForExtent(inExt, c_in);
          inPtr = inArray->GetVoidPointer(cellId * numComp);
          cellId = vtkStructuredData::ComputeCellIdForExtent(outExt, c_out);
          outPtr = outArray->GetVoidPointer(cellId * numComp);
          // cerr << "INITIAL PTRS " << inPtr << " " << outPtr << " "
          //     << c_out[0] << "," << c_out[1] << "," << c_out[2] << ":"
          //     << outExt[0] << " " << outExt[1] << ", "
          //     << outExt[2] << " " << outExt[3] << ", "
          //     << outExt[4] << " " << outExt[5] << endl;

          switch (inArray->GetDataType())
          {
            vtkTemplateMacro(
              vtkImageAppendExecute(this, id, inExt, inData[0][idx1], static_cast<VTK_TT*>(inPtr),
                cOutExt, outData[0], static_cast<VTK_TT*>(outPtr), numComp, true, nArrays));
            default:
              vtkErrorMacro(<< "Execute: Unknown ScalarType");
              return;
          }
        }
      }
    }
  }
}

//------------------------------------------------------------------------------
int vtkImageAppend::FillInputPortInformation(int i, vtkInformation* info)
{
  info->Set(vtkAlgorithm::INPUT_IS_REPEATABLE(), 1);
  return this->Superclass::FillInputPortInformation(i, info);
}

//------------------------------------------------------------------------------
void vtkImageAppend::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);

  os << indent << "AppendAxis: " << this->AppendAxis << endl;
  os << indent << "PreserveExtents: " << this->PreserveExtents << endl;
}

//------------------------------------------------------------------------------
void vtkImageAppend::AllocateOutputData(vtkImageData* output, vtkInformation*, int* uExtent)
{
  output->SetExtent(uExtent);

  // compute number of cells and points in the uExtent
  vtkIdType numpts = 1;
  vtkIdType numcells = 1;
  for (int i = 0; i < 3; i++)
  {
    if (uExtent[i * 2 + 1] >= uExtent[i * 2])
    {
      vtkIdType dim = uExtent[i * 2 + 1] - uExtent[i * 2];
      numpts = numpts * (dim + 1);
      if (dim != 0)
      {
        numcells = numcells * dim;
      }
    }
  }

  // get a hold of any of my inputs to get arrays
  vtkImageData* in = vtkImageData::SafeDownCast(this->GetInputDataObject(0, 0));

  vtkDataSetAttributes *ifd, *ofd;
  ifd = in->GetPointData();
  ofd = output->GetPointData();
  if (ifd && ofd)
  {
    ofd->CopyAllOn();
    ofd->CopyAllocate(ifd, numpts);
    ofd->SetNumberOfTuples(numpts);
  }
  ifd = in->GetCellData();
  ofd = output->GetCellData();
  if (ifd && ofd)
  {
    ofd->CopyAllOn();
    ofd->CopyAllocate(ifd, numcells);
    ofd->SetNumberOfTuples(numcells);
  }
}

//------------------------------------------------------------------------------
vtkImageData* vtkImageAppend::AllocateOutputData(vtkDataObject* output, vtkInformation* outInfo)
{
  // set the extent to be the update extent
  vtkImageData* out = vtkImageData::SafeDownCast(output);
  if (out)
  {
    int* uExtent = outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT());
    this->AllocateOutputData(out, outInfo, uExtent);
  }
  return out;
}

//------------------------------------------------------------------------------
void vtkImageAppend::CopyAttributeData(vtkImageData* vtkNotUsed(input),
  vtkImageData* vtkNotUsed(output), vtkInformationVector** vtkNotUsed(inputVector))
{
  // Do not simply shallow copy forward the data as other imaging filters do.
  // We have to append instead.
}
